1DW9

Structure of cyanase reveals that a novel dimeric and decameric arrangement of subunits is required for formation of the enzyme active site

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.3		SELENOMETHIONINE LABELLED CRYSTALS WERE GROWN BY THE SITTING DROP METHOD OF VAPOUR DIFFUSION FROM 50% AMMONIUM SULPHATE SOLUTIONS BUFFERED WITH 50MM NAKPO4, PH = 7.3, AND IN THE PRESENCE OF 50 MM TRIC/HCL, PH =7.3. MICROSEEDING WITH WILD-TYPE CRYSTALS PRODUCED CRYSTALS THAT GREW TO 0.1 X 0.2 X 0.7 MM OVER 5-7 DAYS.

Crystal Properties
Matthews coefficient	Solvent content
2.53	51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 76.34	α = 70.3
b = 81.03	β = 72.2
c = 82.3	γ = 66.4

Symmetry
Space Group	P 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	ARGONNE APS-1	MIRROR	1998-07-15	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID	0.9465, 0.9793, 0.9795, 1.033, 1.078, 1.00	APS	19-ID

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.65	20	94.2	0.039	26.4	2.8		187107			15.6

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.65	1.68	80.6		0.198	3.9	1.7

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	1.65	20	177665	9436	94.2	0.15	0.189	RANDOM	17.9

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	20.2
p_staggered_tor	13
p_planar_tor	6.4
p_scangle_it	3.99
p_scbond_it	2.74
p_mcangle_it	2.14
p_mcbond_it	1.62
p_multtor_nbd	0.25
p_singtor_nbd	0.188
p_chiral_restr	0.17
p_planar_d	0.038
p_angle_d	0.033
p_bond_d	0.018
p_plane_restr	0.015
p_angle_deg
p_hb_or_metal_coord
p_xhyhbond_nbd
p_xyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	11970
Nucleic Acid Atoms
Solvent Atoms	1865
Heterogen Atoms	125

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
CNS	phasing